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The results of an internal ballistic parametric study for an a r t i l l e r y w e a p o n b a s e d o n a n electrothermal-chemical (ETC) propulsion system are reported. The study was carried out for four different calibres: 30,mm, 76 m, 120 m and 155 mm. Several d i f f e r e n t w o r k i n g f l u i d s , b o t h endothermic and exothermic, were considered for each calibre. Aspects considered include different proportions of electrical energy to chemical energy, working fluid masses and volumes, and the masses and volumes of the electrical p o w e r supply. C a l c u l a t i o n s w e r e p e r f o r m e d f o r t w o f i x e d m u z z l e velocities and for the case of the msximum stretch potential.

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